// Determine browser and version.

function Browser() {

  var ua, s, i;

  this.isIE    = false;
  this.isNS    = false;
  this.version = null;

  ua = navigator.userAgent;

  s = "MSIE";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isIE = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  s = "Netscape6/";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = parseFloat(ua.substr(i + s.length));
    return;
  }

  // Treat any other "Gecko" browser as NS 6.1.

  s = "Gecko";
  if ((i = ua.indexOf(s)) >= 0) {
    this.isNS = true;
    this.version = 6.1;
    return;
  }
}

var browser = new Browser();

// Global object to hold drag information.

var dragObj = new Object();
dragObj.zIndex = 0;

//function dragStart(event, id) {
function dragStart(e) { 

  var el;
  var x, y;

  // If an element id was given, find it. Otherwise use the element being
  // clicked on.


  if (browser.isIE) dragObj.elNode = event.srcElement;      
  if (browser.isNS) dragObj.elNode = e.target;       

  //if (dragObj.elNode.nodeType == 3) dragObj.elNode = dragObj.elNode.parentNode;
 
  //Lista Esclusione Tag
  if (dragObj.elNode.tagName=="INPUT") return 0;
  if (dragObj.elNode.tagName=="TEXTAREA") return 0;
  if (dragObj.elNode.tagName=="SELECT") return 0;
 
  
  while (dragObj.elNode.className != "dragBox" && dragObj.elNode.className != "mapItem")
  {
    dragObj.elNode = dragObj.elNode.parentNode;
  }
  
  //alert (dragObj.elNode.tagName);

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = e.clientX + window.scrollX;
    y = e.clientY + window.scrollY;
  }

  // Save starting positions of cursor and element.
  //alert(x);
  dragObj.cursorStartX = x;
  dragObj.cursorStartY = y;
  
  //4 DEBUG!
  //document.getElementById("text_debug").value = x + " - " + y;
  //alert (dragObj.elNode.id);
  //alert (dragObj.elNode.style.left);
  //alert (dragObj.elNode.style.top);
  
  dragObj.elStartLeft  = parseInt(dragObj.elNode.style.left, 10);
  dragObj.elStartTop   = parseInt(dragObj.elNode.style.top,  10);

  //if (isNaN(dragObj.elStartLeft)) dragObj.elStartLeft = 0;
  //if (isNaN(dragObj.elStartTop))  dragObj.elStartTop  = 0;

  // Update element's z-index.

  dragObj.elNode.style.zIndex = ++dragObj.zIndex;
  if (document.getElementById("bordo_translucido")) dragObj.elNode.style.zIndex = document.getElementById("bordo_translucido").style.zIndex + 1;

  // Capture mousemove and mouseup events on the page.

  if (browser.isIE) {
    document.attachEvent("onmousemove", dragGo);
    document.attachEvent("onmouseup",   dragStop);
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS) {
    document.addEventListener("mousemove", dragGo,   true);
    document.addEventListener("mouseup",   dragStop, true);
    e.preventDefault();
  }
}

function dragGo(e) {

  var x, y;

  // Get cursor position with respect to the page.

  if (browser.isIE) {
    x = window.event.clientX + document.documentElement.scrollLeft + document.body.scrollLeft;
    y = window.event.clientY + document.documentElement.scrollTop + document.body.scrollTop;
  }
  if (browser.isNS) {
    x = e.clientX + window.scrollX;
    y = e.clientY + window.scrollY;
  }

  // Move drag element by the same amount the cursor has moved.

  dragObj.elNode.style.left = (dragObj.elStartLeft + x - dragObj.cursorStartX) + "px";
  dragObj.elNode.style.top  = (dragObj.elStartTop  + y - dragObj.cursorStartY) + "px";

  //4 DEBUG!
  document.getElementById("text_debug").value = x + " - " + y;

  if (browser.isIE) {
    window.event.cancelBubble = true;
    window.event.returnValue = false;
  }
  if (browser.isNS)
    e.preventDefault();
}

function dragStop(event) {

  // Stop capturing mousemove and mouseup events.

  if (browser.isIE) {
    document.detachEvent("onmousemove", dragGo);
    document.detachEvent("onmouseup",   dragStop);    
  }
  if (browser.isNS) {
    document.removeEventListener("mousemove", dragGo,   true);
    document.removeEventListener("mouseup",   dragStop, true);
  }      
  try { OnDragStop(event)} catch(e) {}
}